Why can't create type Object[] in typescript?

Question

typescript

I have a simple code

class A<T extends Object[]> {
  public B:  T = [{ a: 1 }, { b: 2 }];
}

But an error comes up

Type "({ a: number; } | { b: number; })[]" cannot be assigned to type "T".
"({ a: number; } | { b: number; })[]" can be assigned to a constraint of type "T", but it is possible to instantiate "T" with a different constraint subtype "Object".ts(2322)

How to fix it?

Answer 1

In this case, Tit means any concrete type that is extends Object[].
for example new A<[{c: 3}]>()- it is absolutely valid, while it public Bcan no longer be what you put there.